True or false? Justify (e) Microprogramming is a more flexible and modular way o

Question

True or false? Justify (e) Microprogramming is a more flexible and modular way of deriving control hardware than direct execution. (f) Timing-independence is an enabling feature for a long-lived ISA. (g) The immediate successor to vacuum tubes in computers were integrated circuits. ) The register file is an example of a sequential circuit. (i) RISC instruction sets were primarily motivated by their timing independence feature G) The primary purpose of latches in a pipeline are to hold the output values of each stage during the cycle after that stage executes

Explanation / Answer

(e)Yes,Microprogramming made a control unit easier to design and is more flexible.A control unit can be implemented as a memory which contains patterns of the control bits and part of the flow control for sequencing those patterns. Microprogram control unit is actually like a miniature computer which can be "programmed" to sequence the patterns of control bits. Its "program" is called "microprogram" to distinguish it from an ordinary computer program. Using microprogram, a control unit can be implemented for a complex instruction set which is impossible to do by hardwired.

(f)False.Timing Independence is not an enabling feature for a long lived ISA.

(g)False .After Vacuum tubes Transistor were found and later Integrated circuits. The third generation of modern computers is known for using integrated circuits instead of individual transistors. Jack Kilby at Texas Instruments and Robert Noyce at Fairchild are both credited with having invented the integrated circuit (IC).

(h)True.The two biggest components of a CPU are the register file and the ALU. The register file is a combination of registers and combinational logic, while the ALU is purely combinational logic.

(i)False. The RISC proposal was a response to the changing technology and the accumulation of knowledge from the CISC designs. CISC processors were designed to simplify compilers and to improve performance under constraints such as small and slow memories. The important observations that motivated designers to consider alternatives to CISC designs.

(j)False.Their first and primary purpose is to maintain the reference counts in the BUFFER structure.

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